Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

p-51

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Old 01-21-2010, 08:42 AM
  #1  
craigdennis15
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Default p-51



First off i know i could ask for a cleaner airframe, that said i have a model tech p-51 arc 60 size. im fully sheeting the wings and going to do some light glass in some stress areas. my question is, what kind of speeds could i potentially be looking at with say a st2300, or possibly a moki 1.80? Or i have a webra 1.20 if you feel that there wont be much of an increase in speed vs. weight. I realize speed is relative to final weight and prop selection ect. Just a rough estimate and a recomendation for engine selection would be helpfull. as a side note the st2300 fits in pretty good.Thanks in advance for any help or ideas.

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Old 01-21-2010, 11:54 AM
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Default RE: p-51

I'd say 130-140 max. We have warbird races out here and the fastest planes are the Phoenix Models P-51 with a ducted fan 91. They run around 150-160mph. Your plane is bigger and heavier and won't have as much power. Those motors aren't meant to scream. Out of the three I'd use the Webra with a 14x14ish prop.
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Old 01-21-2010, 04:55 PM
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Default RE: p-51

A Moki 1.8 in a .60 size plane? Crikey. Put a Jett .90 in it. More R's and less weight.
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Old 01-21-2010, 05:20 PM
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Default RE: p-51

i realize its a bit out there i ike warbirds and i would like it to go st s good rate. thank you for the suggestion ive looked at jett engines, they seem of high quality. I guess i should be more specific. i would like to accomplish 120mph and anything above would be a bonus. i realize weight and other factors are variables but any motor suggestions would be great. i know speed costs money however id prefer to not go much over $350ish. on a side note crazy is one of the guys at our field with a 46 size mustang with a ys 160 no that is a quick mustang...
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Old 01-21-2010, 06:47 PM
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Default RE: p-51

A 46 size Mustang with a YS 1.60? Does it have 2 foot tall gear on it? Again, I would rather stick to smaller engines that rev higher. My Weston Magnum (40 size plane) with a Nelson Q40 motor (40 size) on it is clocked at 195 mph. I would still suggest the Jett 90 or 1.20. I would go electric before I went with a huge 2-stroke. You can probably put together a monster electric setup for way less than your budget at www.hobbycity.com.
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Old 01-21-2010, 07:32 PM
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Default RE: p-51

YS is a good way to go. You could stuff anything from a .91 to a 1.70 in that bird if you want to do the modifications.

I have a 110FZ in a PM strega and it'll do 125-130 on 20%. Your plane it a little bigger, but not much. I sheeted the stab, glassed the bottom of the wing and modified the firewall so the motor would fit with the spinner in the stock location.

The nice part about the YS is that it is very responsive and has a very linear throttle, unlike alot of the 2 stroke setups I've seen.
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Old 01-21-2010, 09:14 PM
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Default RE: p-51

I've got to be honest. I think the ST 2300 would work well in that P51. I had a friend who ran a Saito 180 in his and it was fast. The 2300 turns almost exactly the same as the Saito. It won't run with the YS 170, but it is a 1/3 the cost and runs on low nitro fuel. The only downside is that big ol' muffler hanging out. I run a ST 2300 in a F1 Sundowner and it pulls it at around 100 mph.
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Old 01-22-2010, 11:02 AM
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Default RE: p-51

thanks for the suggestions first off. i think i may just try the webra 1.20 on it to begin with and if im not satisfied ill up the power then. does anyone know where i could find a wrap around pitts style? and recomendations on prop selection for top performance would be much appreciated. If i have overlooked any other engine choices (bang for the buck i suppose) feel free to throw them out, also if theres something not to far out of the $350 i threw out let me know what to look at. thanks for all the responses.
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Old 01-22-2010, 02:42 PM
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Default RE: p-51

ORIGINAL: craigdennis15

recomendations on prop selection for top performance would be much appreciated.
For this combo of 60 sized Mustang with Webra 1.20, after punching some numbers through,
I'm thinking APC 14 x 11 or 14 x 12N (Narrow)
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Old 01-22-2010, 04:23 PM
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Default RE: p-51

I agree, if you're using 15% the 14x10-12 props should be good. A guy in our club races one with a 14x14 CF prop on 50%.
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Old 01-22-2010, 09:42 PM
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Default RE: p-51

thanks for all he help. when i finish the project ill either be satisfied or come back asking what engine next.
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Old 01-23-2010, 12:09 PM
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Default RE: p-51

I would start with the Webra...The TS 3200 is very heavy in my opinion you might have to add MORE tail weight after moving the battery aft.

I had a Sig CAP 231EX arf. first with ST 3250 then Saito 180 flew best with the Saito.
with the 3250 it was lithargic. so you need to watch your weight.

bob
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